Smart zone

Early in a session the agent is in a "smart zone" — sharp, focused, recall is good. As the session grows it drifts into a "dumb zone": sloppier, forgetful, more mistakes — and more **faithfulness hallucinations. Same model, same harness — just more context. The felt effect of attention degradation. Clear or compact when the session bloats; don't push through.

Usage:

"It nailed the first three components and just butchered the fourth."

"You're out of the smart zone — same model, just deep into the dumb zone now. Compact and reload the plan, the next component will land."